I would definately max your walls. At TH9 you get alot of new D like xbows, etc. I went TH 9 a couple months ago n im using every coin to upgrade my D. I dont have time for walls yet. Even the 25 new walls i got are pink. Loot is great for me n DE is much better but you have to upgrade ur D if you wanna keep it. That doesnt leave resources or time for walls. Lab upgrades are not a big deal as everybody seems to have to much elix.
I promise you will be happy you did all your walls. Dont worry bout wasting elix.



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